annijahab11
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2 Points
What is an index fossil?
O
A. A fossil that contains rocks and minerals
O
B. A fossil found in rocks from one time period
O
C. A fossil that has vestigial structures
O
D. A fossil that formed 300 million years ago​

Respuesta :

kayleejusick

Answer:

B, A fossil found in rocks from one time period

Explanation:

Fossils are used to determine the ages of rock layers. Index fossils are the most useful for this. Index fossils are of organisms that lived over a wide area. They lived for a fairly short period of time. An index fossil allows a scientist to determine the age of the rock it is in. Hope that this helps you :)

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